This question is in reference to Atlassian Documentation: Excluding releases from your plan
Once a release is excluded, is there a way to bring it back in later when it is more complete and ready to be planned?
I had the same question. You need to reimport it by editing your Issue Sources. See this answer for details:
https://answers.atlassian.com/questions/42694907/how-to-add-excluded-from-plan-item-back-in-portfolio
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